97-03 Grand prix Big3 help

[moparerrnocar 10+ year member]

I got a 97 3.8 that I plan to do the big3 w/ 0awg to run a MBQ 1500D and a MBQ 4.125 A/B.

As GP owners know, there's a fuse box right between the alt and battery. Do I include the box with the run from the alt to battery? Also can I ground the motor/chassis from the alternator case to the shock tower, and the chassis/battery from the shock tower to the battery?

I also got this dude (who thinks he's audio king) telling me I dont need a HO alt, that my stock 105a will feed 2000w no problem. I call BS... Especially considering the accessories need 30a reserve at a minimum... (105a - 30a = 75a) 75a x 14.4v = 1080w.

I already get nasty dimming w/ just the 1500. The amp isn't clipping and the HU isn't cutting out, but the dimming at night is ridiculous. Now I can get a 220a Delco that puts out @ 1,200rpm for $170, and I realise 220 is overkill, but my other option is a 170a bosh @ 1,600rpm for $168. Why not go for 50 extra amps @ 400rpm sooner right? I dont see anything lower than 160a being sufficient.

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[09civic 5,000+ posts]

Bypass the the fuse box. I did the big 3 in my buddies 99' GP

 

[keep_hope_alive Premium Member]

not a bypass, since you leave the stock wire alone. you run a parallel wire from alt to battery - redundant.